x/sys/unix: regenerate darwin/amd64 outputs with the latest SDK

I did this on OS X 10.10.5 (14F27) using the 10.10 SDK included in Xcode
6.4 (6E35b). This required removing a C include from mkerrors.sh, since
it doesn't exist on either of my two systems.

I spot checked the syscall number changes against this definitive list,
which is for approximately my kernel version:

    http://www.opensource.apple.com/source/xnu/xnu-2782.20.48/bsd/kern/syscalls.master

Everything I examined checked out, including the removed syscalls being
marked as "old" or being described in comments as no longer existing.

There is one exception to the output being cleanly autogenerated: I have
manually renamed SYS_SYSCTL back to SYS___SYSCTL, the name used
previously and still used by syscall_bsd.go. Because it would distract
from this CL, I will fix this in an upcoming CL.

Change-Id: I0168f608cab714aa5981b3e7d08d8fd84888d0d5
Reviewed-on: https://go-review.googlesource.com/14006
Reviewed-by: Ian Lance Taylor <iant@golang.org>

unix/zerrors_darwin_amd64.go

@@ -376,6 +376,7 @@ const (
 	F_FLUSH_DATA                      = 0x28
 	F_FREEZE_FS                       = 0x35
 	F_FULLFSYNC                       = 0x33
+	F_GETCODEDIR                      = 0x48
 	F_GETFD                           = 0x1
 	F_GETFL                           = 0x3
 	F_GETLK                           = 0x7
@@ -1019,7 +1020,6 @@ const (
 	SHUT_WR                           = 0x1
 	SIOCADDMULTI                      = 0x80206931
 	SIOCAIFADDR                       = 0x8040691a
-	SIOCALIFADDR                      = 0x8118691d
 	SIOCARPIPLL                       = 0xc0206928
 	SIOCATMARK                        = 0x40047307
 	SIOCAUTOADDR                      = 0xc0206926
@@ -1027,10 +1027,7 @@ const (
 	SIOCDELMULTI                      = 0x80206932
 	SIOCDIFADDR                       = 0x80206919
 	SIOCDIFPHYADDR                    = 0x80206941
-	SIOCDLIFADDR                      = 0x8118691f
 	SIOCGDRVSPEC                      = 0xc028697b
-	SIOCGETSGCNT                      = 0xc014721c
-	SIOCGETVIFCNT                     = 0xc014721b
 	SIOCGETVLAN                       = 0xc020697f
 	SIOCGHIWAT                        = 0x40047301
 	SIOCGIFADDR                       = 0xc0206921
@@ -1056,8 +1053,6 @@ const (
 	SIOCGIFSTATUS                     = 0xc331693d
 	SIOCGIFVLAN                       = 0xc020697f
 	SIOCGIFWAKEFLAGS                  = 0xc0206988
-	SIOCGLIFADDR                      = 0xc118691e
-	SIOCGLIFPHYADDR                   = 0xc1186943
 	SIOCGLOWAT                        = 0x40047303
 	SIOCGPGRP                         = 0x40047309
 	SIOCIFCREATE                      = 0xc0206978
@@ -1087,7 +1082,6 @@ const (
 	SIOCSIFPHYADDR                    = 0x8040693e
 	SIOCSIFPHYS                       = 0x80206936
 	SIOCSIFVLAN                       = 0x8020697e
-	SIOCSLIFPHYADDR                   = 0x81186942
 	SIOCSLOWAT                        = 0x80047302
 	SIOCSPGRP                         = 0x80047308
 	SOCK_DGRAM                        = 0x2
@@ -1114,6 +1108,7 @@ const (
 	SO_NOTIFYCONFLICT                 = 0x1026
 	SO_NP_EXTENSIONS                  = 0x1083
 	SO_NREAD                          = 0x1020
+	SO_NUMRCVPKT                      = 0x1112
 	SO_NWRITE                         = 0x1024
 	SO_OOBINLINE                      = 0x100
 	SO_PEERLABEL                      = 0x1011
@@ -1166,6 +1161,7 @@ const (
 	TCIOFLUSH                         = 0x3
 	TCOFLUSH                          = 0x2
 	TCP_CONNECTIONTIMEOUT             = 0x20
+	TCP_ENABLE_ECN                    = 0x104
 	TCP_KEEPALIVE                     = 0x10
 	TCP_KEEPCNT                       = 0x102
 	TCP_KEEPINTVL                     = 0x101
@@ -1173,13 +1169,14 @@ const (
 	TCP_MAXOLEN                       = 0x28
 	TCP_MAXSEG                        = 0x2
 	TCP_MAXWIN                        = 0xffff
-	TCP_MAX_SACK                      = 0x3
+	TCP_MAX_SACK                      = 0x4
 	TCP_MAX_WINSHIFT                  = 0xe
 	TCP_MINMSS                        = 0xd8
 	TCP_MSS                           = 0x200
 	TCP_NODELAY                       = 0x1
 	TCP_NOOPT                         = 0x8
 	TCP_NOPUSH                        = 0x4
+	TCP_NOTSENT_LOWAT                 = 0x201
 	TCP_RXT_CONNDROPTIME              = 0x80
 	TCP_RXT_FINDROP                   = 0x100
 	TCP_SENDMOREACKS                  = 0x103